|
The Dynamic Albedo of Neutrons (DAN) instrument is an experiment mounted on the Mars Science Laboratory ''Curiosity'' rover. It is a pulsed sealed-tube neutron source and detector used to measure hydrogen or ice and water at or near the Martian surface.〔(【引用サイトリンク】title=MSL Science Corner: Dynamic Albedo of Neutrons (DAN) )〕 DAN was provided by the Russian Federal Space Agency,〔〔 funded by Russia〔(【引用サイトリンク】title=Mars Science Laboratory: Mission )〕 and is under the leadership of Principal Investigator Igor Mitrofanov. On August 18, 2012 (sol ), DAN was turned on, marking the success of a Russian-American collaboration on the surface of Mars and the first working Russian science instrument on the Martian surface since Mars 3 stopped transmitting over forty years ago.〔(NSSDC – Mars 3 )〕 The instrument is designed to detect subsurface water.〔 On March 18, 2013 (sol ), NASA reported evidence of mineral hydration, likely hydrated calcium sulfate, in several rock samples including the broken fragments of "Tintina" rock and "Sutton Inlier" rock as well as in veins and nodules in other rocks like "Knorr" rock and "Wernicke" rock. Analysis using the rover's DAN instrument provided evidence of subsurface water, amounting to as much as 4% water content, down to a depth of , in the rover's traverse from the ''Bradbury Landing'' site to the ''Yellowknife Bay'' area in the ''Glenelg'' terrain.〔 On August 19, 2015, NASA scientists reported that the DAN instrument on ''Curiosity'' detected an unusual hydrogen-rich area, at "Marias Pass," on Mars. The hydrogen found seemed related to water or hydroxyl ions in rocks within three feet beneath the rover, according to the scientists. ==See also== *Exploration of Mars *Groundwater on Mars *Timeline of Mars Science Laboratory *Water on Mars 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dynamic Albedo of Neutrons」の詳細全文を読む スポンサード リンク
|